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This document is in response to the mandate contained in the National Aeronautics and Space Administration (NASA) Authorization Act of 2010, Pub. L. No. 111-267, Section 503(c)(2), for GAO to provide an evaluation of the accuracy and level of confidence in the findings contained in NASA's assessment of the essential modules, operational systems and components, structural elements, and permanent scientific equipment required to ensure complete, effective, and safe functioning and full scientific utilization of the International Space Station through 2020. We provided to Congress a draft copy of this briefing in meetings with them on April 6 and 7, 2011. We also provided a draft to NASA for comment. NASA agreed with our findings and provided technical comments that we incorporated as appropriate.